Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) in Environmental Waters by GC-MS
Methodology for detecting trace polycyclic aromatic hydrocarbons (PAHs) in environmental water samples using GC-MS and specialized capillary columns.
Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) in Environmental Waters by GC-MS Abstract Polycyclic aromatic hydrocarbons (PAHs) are persistent environmental pollutants with known carcinogenic and mutagenic properties. This article reviews solid-phase extraction (SPE) and gas chromatography-mass spectrometry (GC-MS) methodologies for monitoring trace PAHs in water bodies. Introduction Environmental monitoring agencies enforce stringent limits on priority pollutant PAHs in surface and drinking waters [1]. Gas chromatography coupled with mass spectrometry provides the required sensitivity and selectivity for multi-component PAH screening. ROWELL supplies environmental testing laboratories with low-bleed GC capillary columns and SPE consumables. Analytical Workflow for PAH Detection | Workflow Step | Consumable / Technique | Objective | | :--- | :--- | :--- | | Sample Extraction | Solid-Phase Extraction (SPE) C18 cartridges | Pre-concentrate trace PAHs from large water volumes. | | Chromatographic Separation | Specialized low-bleed GC capillary columns (e.g., Rxi-5Sil MS) | Resolve structural isomers (e.g., chrysene vs. benzofluoranthenes). | | Detection | GC-MS in Selected Ion Monitoring (SIM) mode | Achieve low parts-per-trillion (ppt) detection limits. | 1. Minimizing Isomer Co-elution PAH analysis features numerous structural isomers that present significant separation challenges. Stationary phases with specialized aryl-silarylene incorporation provide the necessary selectivity to resolve complex isomer pairs. 2. Low Column Bleed for Trace Analysis Trace environmental monitoring demands ultra-low column bleed to maintain stable baselines and accurate quantification at sub-ppb levels. Practical Recommendations - Glassware Silanization : Prevent adsorption of heavy